“Most companies measure performance based on individual accomplishments. But that system doesn’t reward people for a lot of essential behind-the-scenes work. And it can reward people that either take credit for others’ work, or are better at showing off than working. The traditional approach sometimes advances the wrong people, and can end up hurting companies, Grant argues.”
http://qz.com/197420/the-best-measure-of-an-employee-is-how-well-she-mentors-others/